<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body{
            margin: 0px;
            padding: 0px;
        }

        .header{
            width: 100vw;
            height: 50px;
            background-color: #ccc;
            position: fixed;
            top: 0px;
            border-bottom: 1px solid #ddd;
        }
        .header div{
            float: left;
            width: 33%;
            height: 50px;
            line-height: 50px;
            text-align: center;
        }
        .main{
            height: 100vx;
            background-color: #ddd;
        }
        .footer{
            width: 100vw;
            height: 50px;
            background-color: #ccc;
            position: fixed;
            bottom: 0px;
            border-top: #ddd;
        }
        .footer div{
            float: left;
            width: 25%;
            height: 50px;
            line-height: 50px;
            text-align: center;
    
        }
        .footer div:nth-child(n+2){
            border-left: #ddd solid 1px;
        }
    </style>
</head>
<body>
    <div class="header">
        <div class="left">&lt;</div>
        <div class="middle">微信</div>
        <div class="right">...</div>
    </div>
    <div class="main"></div>
    <div class="footer">
        <div>微信</div>
        <div>通讯录</div>
        <div>发现</div>
        <div>我</div>
        <div>我</div>
    </div>
</body>
</html>